By 2020, the total number of transmission lines will increase to approximately
2,106 kilometres (Jona, 2011). The transmission development plan consists of 17
projects for transmission lines to be built. This will expand the grid to cover the
main parts of the country, particularly in areas of high population density, which are
in the areas along the Mekong and Tonle Sap Rivers. Electricity distribution,
however, to areas of low density remains a critical challenge because of the economy
of scale and efficiency issues. For these reasons, electricity generated from
renewable resources is the solution.